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Corallina officinalis
''Corallina officinalis'' is a calcareous red seaweed which grows in the lower and mid-littoral zones on rocky shores.
It is primarily found growing around the rims of tide pools, but can be found in shallow crevices anywhere on the rocky shore that are regularly refreshed with sea water. It predominantly grows on the lower shore, especially where fucoid algae are absent, but is also found further up shore on exposed coasts.
It forms calcium carbonate deposits within its cells which serve to strengthen the thallus. These white deposits cause the seaweed to appear pink in colour, with white patches where the calcium carbonate is particularly concentrated, such as at the growing tips. The calcium carbonate makes it unpalatable to most rocky shore grazers.
==Description==
The thallus of ''C. officinalus'' is firmly attached generally to rock and grows in tufts to a length of 120mm. It has pinnate branching with successive opposite lateral branches.〔Newton, L. 1931. ''A Handbook of the British Seaweeds.'' British Museum (Nat. Hist.) London〕 Each frond consists of cylindrical calcified stipes which show segments each a little longer than broad, rising from a crustose base like a string of beads becoming larger and more wedge-shaped higher up the stipe.〔Dickinson, C.I. 1963. ''British Seaweeds'' The Kew Series. Eyre & Spottiswoode.〕〔Irvine, L.M. & Chamberlain, Y.M. 1994. ''Seaweeds of the British Isles.'' Vol. 1 Rhodophyta. Part 2B. Corallinales, Hildenbrandiales. HMSO.ISBN 0 11 310016 7〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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